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On something as thick as a razor, the odds of warping are really low if it is annealed beforehand.

You can also get that effect by just quenching that part of the razor and not sticking it in the quenchant completely.

File may be good steel. Or not. For knives it is less important because knives have enough mass that things like microchipping don't matter as much. In any case, the HT properties are unknown, making...

What's the width and thickness of the blade?

Amen about the steel.
For the price that this is going to cost, there is absolutely no point in using unknown file steel instgead of 5 to 10 $ worth of O1. Also it is hard to ask someone to do just...